package com.example.wordcount;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;
import java.io.IOException;

public class WordCountReducer extends Reducer<Text, IntWritable, Text, IntWritable> {
    /* 参数 <KEYIN, VALUEIN, KEYOUT, VALUEOUT> */
    @Override
    protected void reduce(Text key, Iterable<IntWritable> values, Context context)
        throws IOException, InterruptedException {
        int count = 0;
        for (IntWritable value: values) {
            count += value.get();
        }
        context.write(key, new IntWritable(count));
    }
}